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If it gradually drifts to that state after warmup, and you left original resistors in it one may be drifting high. I'd check resistors that set the grid/cathode bias on the vertical output...My guess the DC grid voltage on the vert out is becoming more positive relative to the cathode turning the tube on harder (increasing DC current and cooking that resistor) till the vert drive waveform gets distorted at the output plate.
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